I had my DNA tested by 23andme.com. They give me a very long string for my DNA. How do I determine which of the three Ethiopian valleys I descended from? I'm of European descent.
I take it you logged into the 23andme site and looked at your data there?
They have a pretty good geographical plot of where you came from.
Are you looking for more detail than that? You might try the National Geographic Genographic Project.